Cold storage refrigerant leakage detection methods | Soap water, electronic leak detector, pressure holding leak detection, halogen leak detection practical operation
Refrigerant leakage is a high-frequency fault in the cold storage system, where the leakage point continues to leak fluorine, resulting in a decrease in evaporation pressure, poor cooling, increased power consumption, long-term liquid shortage operation, and damage to the compressor due to high exhaust temperature.
Pressure holding leak detection is suitable for newly installed overhaul systems: nitrogen pressure is applied at 1.8-2.0MPa, and the system is left to stand for 24 hours. Only when the pressure drop does not exceed 0.02MPa after environmental temperature correction, can it be considered qualified.
Soap water leak detection is suitable for welds, joints, valves, and flanges, with the advantage of low cost; Minor and slow leakage are difficult to detect, suitable for rough inspection. After operation, clean with clean water to prevent corrosion of copper pipes.
Electronic halogen leak detector is suitable for trace slow leakage, with high sensitivity and priority for detecting joints, valve stem seals, and compressor shaft seals; The leak detector probe should not be directly aimed at oil stains or large amounts of refrigerant injection.
The Xitelide unit is equipped with nitrogen pressure and leak detection at the factory. The shaft seal, valve components, and welding positions are the key leak detection points at the factory and also the highest leakage points during later use.
The slow leakage of the compressor shaft seal is very concealed and belongs to continuous micro leakage. After several months, the refrigerant gradually decreases, and many people mistakenly believe it is normal loss. There is no natural consumption in the HFC refrigerant system.
Many construction sites only press for half an hour before releasing pressure, and small leaks cannot be revealed. After delivery to customers, there is a shortage of refrigerant after 1-3 months of use, and repeated on-site fluorine replenishment is required.
The pipeline of parallel units is complex, and the pressure can be isolated in sections. It can maintain pressure in a single channel and quickly locate which evaporator or main pipeline has a leak, without the need for a complete system investigation.
The export units for foreign trade experience vibration during sea transportation, and the flanges and joints are prone to loosening. It is recommended to conduct a secondary pressure and leak detection before installation at the port to avoid further inspection and repair at the customer's site.
Leak detection sequence: First, check the oil stains. The location of refrigerant leakage is usually accompanied by the leakage of refrigerant oil; Prioritize the inspection of oil contamination points, followed by instrument retesting for higher leak detection efficiency.
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FAQ
What is the general nitrogen holding pressure for a new system? 1.8-2.0MPa nitrogen holding pressure.
How much pressure drop is qualified after 24 hours of holding pressure? The pressure drop after temperature correction is ≤ 0.02MPa.
3. Will there be natural loss of refrigerant in the refrigerant system? Qualified closed system refrigerant will not be consumed.
4. Characteristics of shaft seal leakage? Micro leakage, gradually lacking refrigerant for several months, with strong concealment.
5. What are the disadvantages of soap water leak detection? Small slow leaks are not easy to detect.
What clues should be prioritized for leak detection? Prioritize checking if there is any oil leakage from the pipeline.
How to quickly detect leaks in parallel complex pipelines? Segmented isolation and separate pressure maintenance.
